What do you get when you mix Medusa and a big bucket of water? Petrifying water, of course! - or some wet snakes, but whatever, you got the point.At first I didn't believe what I was reading but it seems that there is a lake in Tanzania that provokes this effect in animals that touch its water. The lake Natron has high alkalinity, with ph levels between 9 and 10,5 and, apparently, this makes the animals get petrified for eternity. Birds and bats are common victims of the lake - the reflex of the light in the waters confuses them and, as a result, they fall in the water. Remaining in the water, their carcasses are calcified and perfectly preserved as they dry out.